Styled after the anonymous British vandal-artist Banksy, Kabul's streetwise stealth stencillers go by the moniker "Talibanksy", a reference to the Islamist Taliban who have been waging war in Afghanistan for almost nine years.

The street art forms a commentary on the cost in blood and treasure of the war, which has brought 126,000 US and NATO troops to Afghanistan and kills about 2,000 Afghan civilians a year, according to the UN.

Black, spray-painted silhouettes of soldiers and dollar signs, poppies, helicopters and tanks, and children running hand-in-hand began appearing in downtown Kabul a few months ago.

Some show the shadow of a helmeted soldier holding an assault rifle, inside a red circle with a line through it. Others have a silhouetted gun-toting trooper and a dollar sign joined by an equals symbol.

Or simply the words: Cost Of War.

Financially the war is estimated to cost some 100 million dollars a day, according to US media reports.

The human cost to foreign forces so far this year is close to 170, according to the icasualties.org website which keeps tally and says that of the 1,737 who have died since the war began in 2001, 1,051 were Americans.

The people behind the anti-war graffiti call themselves Combat Communications, and claim to be "a small anonymous group of international artists founded last year with the sole aim of advocating/promoting free expression".

According to a statement, they wish to remain anonymous and call their work "social and politically driven graphics".

"This form of self-expression is open to anyone. The youth of Kabul have no real outlet for artistic expression," it says, adding: "Do they want it?"

The Westerners behind Combat Communications declined to speak to AFP, saying they wanted to keep a low profile while they developed their strategy.

Since the fall of the Taliban, Afghanistan has begun moving towards democracy -- with the second parliamentary election set for September -- and freedom of expression is protected by the constitution.

Yet as the insurgency moves deep into its ninth year and the US-led counter-insurgency revs up with foreign troop numbers set to peak by August at 150,000, Kabul remains a city scarred by war and corruption.

Open drains run alongside the main roads, few sidestreets are paved, traffic control is derisory and public transport virtually non-existent.

Two-metre-high concrete blast walls surround most public buildings and embassies, and residential neighbourhoods feature the "narco-tecture" of garishly-tiled, multi-storey mansions most believe are built with the proceeds of the three-billion-dollar-a-year illicit drugs trade.

A cloud of filth from diesel-powered vehicles sits atop a city surrounded on three sides by the peaks of the Hindu Kush mountains, and piles of garbage are picked over by beggars and animals alike.

Consumer price inflation is said to be around 20 percent, helicopter gunships provide an almost constant overhead clatter, and Afghans desperate to leave their country for a new life form long queues at visa offices.

Into this harsh landscape, the sudden appearance of modern street art has added a touch of colour and controversy -- and the blast walls provide the perfect canvas.

Talibanksy's tags are not yet as ubiquitous as Banksy's guerilla art became in London and other British cities over the last decade.

Nor is it as sophisticated, so far presenting little more than simple anti-war messages and slogans, in contrast to the infinitely more clever, caustic and creative Banksy murals.

And whereas Banksy branched out to the US, Australia and the Middle East, becoming an international phenomenon and wealthy in the process, Combat Communications appears to be starting out with more modest ambitions.

The statement contains an anti-capitalist message, hitting out at the massive billboards that dominate city intersections, advertising telecommunications firms or warning against involvement in the drugs trade.

"'Selling the peace' AKA (also known as) winning the war, has also become a big industry. Propaganda is everywhere from counter-narcotic campaigns to counter-terrorism to army recruitment. You can't move without some form of visual purposeful persuasion burning a hole in your soul," it says.